It looks like you are missing get.

$threads = Thread::whereHas('users', function($query) {
  $query->where('owner_id', auth()->user()->id);
})->get();

thomastkim said:

It looks like you are missing get.

$threads = Thread::whereHas('users', function($query) {
 $query->where('owner_id', auth()->user()->id);
})->get();

Thanks, I tried but it still doesn't work regardless get() or not

Hmm...I could think of / see two things.

1. First, you need to access the pivot attribute on each individual user. If you take a look at the docs: http://laravel.com/docs/master/eloquent-relationships

You'll see that you need to loop through the related model (in this case, the user), and then access the pivot table.

2. Does the users table have an owner_id? If not, that will also be a problem.